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Sagot :
Active transport moves molecules from one side of the membrane to the other against their electrochemical gradient. It needs energy to occur. The answer is active transport.
What is active transport?
Active transport is one of the three cellular transmembrane transports. The other two are passive transport and simple diffussion.
Active transport acts against the electrochemical gradient, so it does need the energy to transport substances. It carries molecules from a low concentration side of the membrane to a high concentration side.
The used energy comes from ATP (Na-K bomb) or the membrane's electric potential.
Carrier proteins are involved in active transport.
Hence, the process that requires cellular energy to move a substance against its concentration gradient is called Active transport.
You can learn more about active transport at
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